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Old 04-30-2010, 11:14 AM   #1
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Running pitched drain through joists


So what is the best way to drill and run 1 1/2 in pvc piping through joists? Ive learned that I need 1/4" per foot pitch. Since Im unable to run the entire length with one solid pipe, I assume Ill just run one pipe with a junction between each joist. Will this give me enough flexibility to get this pitch? Also, from others expiriences, is it better to measure and drill the holes in advance to running the piping or to do each joist one at a time as I run the piping. Im running the pipe about 6 feet. I believe its through 4-5 joists as theyre on 16 on center. Thanks!

Shane

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Old 04-30-2010, 11:37 AM   #2
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Running pitched drain through joists


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Not good to run pipe through joist weaken structure
Ive been told otherwise, assuming its done properly. Can someone back me up on this?

Shane

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Old 04-30-2010, 12:01 PM   #3
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Running pitched drain through joists


how low on your first joist and what size joist
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Old 04-30-2010, 12:19 PM   #4
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Running pitched drain through joists


They are 6 inch joists and I can start it at any depth.

Shane
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Old 04-30-2010, 12:24 PM   #5
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Running pitched drain through joists


The problem is that the hole may not be too close to either the top edge or the bottom edge. This severely restricts the manner in which you can slope the drain pipe.

I am not sure what the limits are but I thought it was no closer than 2 inches to the edge.
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Old 04-30-2010, 12:29 PM   #6
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Running pitched drain through joists


2x6 i would say no, not enough wood
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Old 04-30-2010, 12:48 PM   #7
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Running pitched drain through joists


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2x6 i would say no, not enough wood
Thats what she said...

Anyway, I was calculating wrong. I was measureing from the top at both places not thinking about the bottom of the pipe being too close at the end. Shoot, I guess Ill have to find another way. Thanks!

Shane

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Old 04-30-2010, 01:50 PM   #8
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Running pitched drain through joists


Why are you having to consider going through the joists? Are these pipes being installed in a ceiling/floor?

what are your other options? Through a wall, instead of across the joists - maybe you can send the drain line down between them longways and relocate your connections?

Describe your plumbing situation - everything has more than one solution.
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Old 04-30-2010, 02:00 PM   #9
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Running pitched drain through joists


Well, Im now thinking that I may be able to go along the joists, out into the knee wall area and then over the the joist run where the drain is located. Im just hoping that I can get enough pitch in the pipes this route. Otherwise, I think Im in real trouble.

The setup is really hard to describe and I cant figure out how to post a paint document as it keeps telling me the size isnt correct no matter how small I make it.

Shane
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Old 04-30-2010, 02:35 PM   #10
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Running pitched drain through joists


there a reason you see boxed in areas in some rooms just for this reason
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Old 04-30-2010, 02:38 PM   #11
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Running pitched drain through joists


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there a reason you see boxed in areas in some rooms just for this reason
I dont understand what you mean.

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Old 04-30-2010, 03:04 PM   #12
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Running pitched drain through joists


ever see a room with a portion of the ceiling that has a boxed in area,located in one corner of the room? picture a duct running thru the room to another location you make a covering to hide the duct with 2x4s and drywall. you could do the same thing for your drain. sorry i dont know how to describe it better or do those things where you can draw a picture and than post it on here.

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Old 04-30-2010, 03:16 PM   #13
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Running pitched drain through joists


Gotcha. I think, if it is allowed, that running it through the knee wall is feasible. Ill just have to measure to be sure when I get home.

Just a quick note then. With the drain for the tub coming right off the bottom of the tub, since a 45 degree elbow would put too much pitch on the drain pipe, how do you get the proper drop per foot? Does the PVC have enough flex to do this without stressing the glued joints too much?

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Old 04-30-2010, 03:25 PM   #14
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Running pitched drain through joists


You mean - instead of a 45 you'd use a 90?
This doesn't matter, actually - because your S or P trap will be near the tub - this actually gives a bit of play room and allows for the remainder of the pipe to slope properly.

If you have a long run of PVC, though, it will be able to flex a bit - but it's never ideal to force it to flex too much - that puts undo stress and might lead to fractures and collapse.

there are several sizes of joints sold: 90, 60, 45 and 22 - by combining a few of these with your needed length of pipe you can get whatever shape or slope you need.

so - if I had to do your work - and I was limited by space to using a 90 I would quickly follow behind that with a 22 to get the pipe to begin to slope downward. If that slopes too much - then I'd install another 22 along the pipe to keep it from being too steep.
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Old 04-30-2010, 03:26 PM   #15
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Running pitched drain through joists


if i remember you said youre going 6 feet thats only an 1" 1/2 of drop shouldnt be much problem to get that using pvc, just glue it with the slope in it already. dont forget to use primer before you glue it


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